blending silicone & other elastomer

[gogreen2013]

Can silicone be blended/mixed with other elastomer such as nitrile to improve oil resistance properties.

Jain AK, Rubber technologist

https://www.rubbersheetindia.co.in

 

[TugboatEng]

Silicone has good resistance to oil. It's just very permeable. There are companies that produce low permeability silicone such as Arlon. The technology is proprietary.

https://www.rogerscorp.com/elastomeric-material-solutions/arlon-silicones

For oil resistance without other information, HNBR is a top choice.

 

[WKTaylor]

Like...

MIL-DTL-25988 RUBBER, FLUOROSILICONE ELASTOMER, OIL-, HYDRAULIC FLUID-, AND FUEL-RESISTANT, SHEETS, STRIPS, MOLDED PARTS, AND EXTRUDED SHAPES [FVMQ]

[various AMS specs] Fluorocarbon Rubber [FKM]

See ==>SAE AIR786 Elastomer Compatibility Considerations Relative to Elastomer Selection

Regards, Wil Taylor
o Trust - But Verify!
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[Compositepro]

Silicone and nitrile each have their own characteristic properties, but are generally not compatible to blend with each other due to very different solubility characteristics, meaning they don't mix.

 

[btrueblood]

Would add to what CPro said, I don't think it's possible to make a good adhesive bond of the two rubbers either.

 

[gogreen2013]

@Tugnoateng HNBR is okay for oil but might not bear high temperatures, we are looking for 200 deg C temp. range rubber

Jain AK, Rubber technologist

https://www.rubbersheetindia.co.in

 

[ayla zee]

yes, silicon can be blended with other elastomers such as fluorocarbon, ethylene propylene, and fluorosilicon and these blends definitely improve resistance to heat, oil, and fuel, etc. Personally, I prefer silicon, HNBR, and PTFE Coated O Rings.